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ADS42P42 EVM: external SPI control

Marc-Andre Provencher
Prodigy 50 points
Other Parts Discussed in Thread: ADS62P42

Hi,

I presently have in hand a ADS62P42 EVM REV.B. What i would like to accomplish is to use your eval board but write myself into the registers without using the usb interface or parallel options available with the jumpers. I would like to do it with the Rasberry Pi using his GPIO pins and bit-banged the data to the registers managing the RESET, SCLK, SEN and SDATA inputs. I would like to know if it's possible to connect on the second pin where are located JP8, JP9, JP10 and JP11, disconnect those jumpers and supply the 5V_AUX_IN(P5)? From the schematics, it seems possible but i wanted to double check. Thanks a lot !

  • 0
    TI__Genius 17290 points

    Hi Marc-Andre,

    Yes, you can definitely do this. Make sure you connect ground between the two boards as well. Not quite sure what the question is about the 5V_AUX_IN... If you mean take it off the board for your Raspberry Pi, then that should be fine.

    Regards,
    Matt Guibord 

  • 0 in reply to Matt Guibord
    Prodigy 50 points

    Thanks for your answer! What i meant by the 5V_AUX_IN was the way to power your board. From what I read in the data sheet of the board, it is possible to power the board only with 5V connected to the 5V_AUX_IN  and the ground to P2 and P4. From what I understand, there's a tension regulator that converts the 5V in 3.3V(maybe U5) for the sections that need 3.3V.

    I wanted to confirm that the board outputs 3.3V in case of a read since the Rasberry Pi is very susceptible to voltage higher than 3.3V. But I just noticed that the SDOUT pin isn't connected to the board. Is that correct ? Thanks! 

  • 0 in reply to Marc-Andre Provencher
    TI__Genius 17290 points

    Hi Marc-Andre,

    Yes, just provide 5V to P5 and ground to P2 and P4. U5 and U7 are LDOs that create the 3.3V supplies.

    You're correct that SDOUT isn't connected on Rev B of this EVM. This was fixed on later revisions.

    Regards,
    Matt Guibord